Thread: Problems with database bloat

I hope I'm reading this query wrong:

trend=# select relname, relpages*8192/reltuples from pg_class where reltuples>0 order by relpages desc limit 10;
            relname            |     ?column?
-------------------------------+------------------
 property                      | 19935.4468376195
 result_entry_pkey             | 1611.15654062026
 result_entry                  | 1417.71707157196
 person                        | 7107.41684585612
 property_feature_pkey         | 98.7810833557521
 property_feature              | 60.2035684051268
 person_name_i                 | 3358.93641334398
 property_price_i              | 1978.89907374882
 property_mls_listing_number_i | 1923.61833274788
 property_spatial              | 1784.73493686332
(10 rows)

If I have this query right in my head, this means that the average tuple in the property relation is taking up 19k? and the average tuple in the result_entry_pkey index is take 1.5k?!

Is there a way I can get the database to coalesce free space?  A vacuum verbose shows that I have enough entries in the free space map...

Alex.

On Thu, Jun 08, 2006 at 06:03:23PM -0400, Alex Turner wrote:
> I hope I'm reading this query wrong:
>
> trend=# select relname, relpages*8192/reltuples from pg_class where
> reltuples>0 order by relpages desc limit 10;
>            relname            |     ?column?
> -------------------------------+------------------
> property                      | 19935.4468376195
> result_entry_pkey             | 1611.15654062026
> result_entry                  | 1417.71707157196
> person                        | 7107.41684585612
> property_feature_pkey         | 98.7810833557521
> property_feature              | 60.2035684051268
> person_name_i                 | 3358.93641334398
> property_price_i              | 1978.89907374882
> property_mls_listing_number_i | 1923.61833274788
> property_spatial              | 1784.73493686332
> (10 rows)
>
> If I have this query right in my head, this means that the average tuple in
> the property relation is taking up 19k? and the average tuple in the
> result_entry_pkey index is take 1.5k?!
>
> Is there a way I can get the database to coalesce free space?  A vacuum
> verbose shows that I have enough entries in the free space map...

A lazy vacuum won't reclaim empty space, only a VACUUM FULL will.

If that drops the size of the relations substantially, you'll probably
want to REINDEX everything to reclaim lost space in the indexes as well.
--
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

Yeah - I just did a reindex, that fixed the indexes at least.

Alex

This tells me that you need to be vacuuming more. Autovac is your
friend.

On Thu, Jun 08, 2006 at 07:14:01PM -0400, Alex Turner wrote:
> Yeah - I just did a reindex, that fixed the indexes at least.
>
> Alex
>
> On 6/8/06, Jim C. Nasby <jnasby@pervasive.com> wrote:
> >
> >On Thu, Jun 08, 2006 at 06:03:23PM -0400, Alex Turner wrote:
> >> I hope I'm reading this query wrong:
> >>
> >> trend=# select relname, relpages*8192/reltuples from pg_class where
> >> reltuples>0 order by relpages desc limit 10;
> >>            relname            |     ?column?
> >> -------------------------------+------------------
> >> property                      | 19935.4468376195
> >> result_entry_pkey             | 1611.15654062026
> >> result_entry                  | 1417.71707157196
> >> person                        | 7107.41684585612
> >> property_feature_pkey         | 98.7810833557521
> >> property_feature              | 60.2035684051268
> >> person_name_i                 | 3358.93641334398
> >> property_price_i              | 1978.89907374882
> >> property_mls_listing_number_i | 1923.61833274788
> >> property_spatial              | 1784.73493686332
> >> (10 rows)
> >>
> >> If I have this query right in my head, this means that the average tuple
> >in
> >> the property relation is taking up 19k? and the average tuple in the
> >> result_entry_pkey index is take 1.5k?!
> >>
> >> Is there a way I can get the database to coalesce free space?  A vacuum
> >> verbose shows that I have enough entries in the free space map...
> >
> >A lazy vacuum won't reclaim empty space, only a VACUUM FULL will.
> >
> >If that drops the size of the relations substantially, you'll probably
> >want to REINDEX everything to reclaim lost space in the indexes as well.
> >--
> >Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
> >Pervasive Software      http://pervasive.com    work: 512-231-6117
> >vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461
> >

--
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

I tried searching for this but didn't see anything.

Is there a way I can see the last 5 or last 1 SQL statements that have been
run on the server?  I'm using 8.1.3

am  10.06.2006, um 14:09:36 -0500 mailte Adam folgendes:
> I tried searching for this but didn't see anything.
>
> Is there a way I can see the last 5 or last 1 SQL statements that have been
> run on the server?  I'm using 8.1.3 ---------------------------(end of

'log_statement = all'

in your postgresql.conf

Than can you see all of your SQL-Statements in the log.


Andreas
--
Andreas Kretschmer    (Kontakt: siehe Header)
Heynitz:  035242/47215,      D1: 0160/7141639
GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net
 ===    Schollglas Unternehmensgruppe    ===

I suspect that my manualy vacuum every 10 days or so really wasn't nearly enough ;)

Alex